Innovative Food Science & Emerging Technologies
·
2018
·
IF 3.116
Qisen Xiang,Xiufang Liu,Shengnan Liu,Yunfang Ma,Chunqing Xu,Yanhong Bai
The efficacy of nonthermal plasma-activated water (PAW) in the decontamination of mung bean sprouts was evaluated in this work. After being treated with PAW for 30 min, the populations of total aerobic bacteria and total yeasts and moulds on mung bean sprouts were decreased by 2.32- and 2.84- log 10 CFU/g, respectively. The PAW treatment had no significant effect on the antioxidant potential of mung bean sprouts as shown by using 2,2-diphenyl-1-picrylhydrazyl free radical (DPPH•) scavenging activity assay, 2,2′-azino-bis(3-ethylbenzothiazoline-6-sulfonic acid) diammonium salt (ABTS) method, and ferric reducing antioxidant power (FRAP) assay ( p > 0.05). Additionally, the PAW treatment caused no significant changes in the total phenolic and flavonoid contents, nor the sensory characteristics of mung bean sprouts ( p > 0.05). Reactive species such as nitrates, nitrites, and H 2 O 2 were generated in PAW, which presumably contributed to the disinfection efficacy of PAW. These data show that PAW can be used as a promising nonthermal technology for the control of microbial contamination in sprouts. Industrial relevance Edible sprouts are common food ingredients across the world. However, sprouts can be contaminated by pathogenic microorganisms, which may result in health risks to humans. Recently, PAW has been shown to be a safe and effective method for food surface sanitation. However, the application of PAW in the microbial control for sprouts is less investigated. In this study, the influences of PAW on the microbial load , chemical and sensory quality of mung bean sprouts were investigated for the first time. The results showed that PAW could effectively inactivate bacteria and yeasts and moulds on mung bean sprouts without resulting in significant changes in the antioxidant capacities , total phenolic and flavonoid contents, and sensory characteristics of mung bean sprouts. These data indicated that PAW can be used as a promising nonthermal technology for reducing microbial populations on sprouts.
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高影响因子
Journal of Analytical Methods in Chemistry
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2019
·
IF 1.589
Zaizhi Liu,Lingtao Kong,Shunbao Lu,Zhengrong Zou
A free-of-dust pollution extraction method combined-homogenate and ultrasonic cavitation system, namely, homogenate-combined ultrasonic cavitation synergistic extraction (HUCSE), was proposed for the efficient extraction of flavonoids from Cinnamomum camphora leaves. Response surface methodology of Box–Behnken design was employed to optimize the HUCSE process, and the optimum operation conditions attained with an extraction yield of 7.95 ± 0.27 mg/g were ethanol concentration 76%, homogenate/ultrasonic time 25 min, solvent-to-solid ratio 22 mL/g, and ultrasonic power 240 W. A second-order kinetic mathematical methodology was performed to depict the behaviors of HUCSE and heat reflux extraction method. The results suggested that the developed HUCSE is an efficient and green method for the extraction of C. camphora flavonoids or other plant natural products, where the obvious higher parameters of extraction capacity at saturation, second-order extraction rate constant, and original extraction rate were obtained when compared to the heat reflux method. The antioxidant activity assays in vitro showed that the C. camphora flavonoids possessed strong antioxidant activity and are promising to be applied as a natural alternative antioxidant.
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Food Science & Nutrition
·
2019
·Vol. 7
·期 3
·949-958
·
IF 1.747
Yaqiong Zhang,Ming Li,Hang Gao,Bo Wang,Xu Tongcheng,Boyan Gao,Liangli (Lucy) Yu
In this study, a new red sorghum variety (Ji Liang No. 1) was investigated for its triacylglycerol (TAG) and fatty acid profiles, carotenoid and tocopherol compositions, total phenolic, total flavonoid and phenolic acid contents, and antioxidant and anti-inflammatory properties. A total of 17 TAGs were identified in the red sorghum oil. Linoleic and oleic acids were the primary fatty acids, contributing more than 80% of the total fatty acids. β-Carotene was the primary carotenoid at a level of 26.14 μg/g. α-, γ-, and δ-tocopherols were at levels of 0.19, 4.08, and 0.10 μg/g, respectively. Moreover, acetone–water (60:40, v/v) extract of the red sorghum exhibited the greatest total phenolic content of 2.77 mg GAE/g and total flavonoid content of 5.44 mg RE/g. The extract had scavenging capacities against DPPH, ABTS + , and peroxyl radicals and suppressed LPS stimulated IL-1β, IL-6, and COX-2 mRNA expressions in a dose-dependent manner. Ferulic, p -coumaric, isoferulic, and p -hydroxybenzoic acids were found in the red sorghum, with ferulic acid as the predominant phenolic acid and mostly in an insoluble bound form. These data indicated a potential utilization of the red sorghum in health-promoting functional food or supplemental products.
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SENSORS AND ACTUATORS B-CHEMICAL
·
2019
·
IF 6.393
Longhua Xu,Mingfei Pan,Guozhen Fang,Shuo Wang
A facile and efficient one-pot approach for the synthesis of carbon dots embedded metal-organic framework@molecularly imprinted polymer nanoparticles (CDs@MOF@MIP), which can be used for highly selective and sensitive optosensing of quercetin (QCT), is reported herein for the first time. Metal-organic frameworks (MOFs) with high specific surface area and porosity were first prepared via a room-temperature reaction and used as a matrix to construct MOF-based sensor. Then, highly blue luminescent carbon dots (CDs) were introduced to act as signal transducer that can sense the bonding interactions between the developed sensor and the target molecules and further transduce them to the detectable fluorescence signals. Final, through a surface molecular imprinting process, the resulting CDs@MOF@MIP was obtained. The CDs@MOF@MIP not only exhibited higher selectivity and sensitivity toward target molecular compared to carbon dots embedded metal-organic framework @non-imprinted polymer (CDs@MOF@NIP), but also showed faster reaction rate than CDs-embedded molecularly imprinted polymer (CDs@MIP) derived from the introduction of porous MOF and the optical detection. This proposed sensor was employed to sense trace QCT, and its fluorescence presented a well linear decline with the increasing concentration of QCT from 0 μM to 50.0 μM with a limit of detection of 2.9 nM (S/N = 3), and the precision for eleven replicate detections of 0.5 μM QCT was 1.9%. This developed CDs@MOF@MIP sensor was also used to determine QCT content in real Ginkgo biloba extract capsules with satisfactory performance, and the results were correlated well with those obtained using high performance liquid chromatography.
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JOURNAL OF CHROMATOGRAPHY B-ANALYTICAL TECHNOLOGIES IN THE BIOMEDICAL AND LIFE SCIENCES
·
2019
·
IF 2.813
Pierre Dramou,Asma Itatahine,Meriem Fizir,Yamina Ait Mehdi,Perpetua Takunda Kutoka,Hua He
In this work, quercetin (Que) molecular imprinted polymer (MIP) material decorated on magnetic graphene oxide (MGO) with high performance was prepared for the first time using a surface-imprinting technique. Magnetic graphene oxide was synthesized using the solvothermal route. Methacrylic acid (MAA) was used as functional monomer , ethylene glycol dimethyl acrylate (EGDMA) as cross-linker; Que. was used as template, for the decoration with MIP. The prepared nanocomposite was examined by different characterization methods including fourier transform infrared spectroscopy (FT–IR), scanning electron microscopy (SEM), vibrating sample magnetometer (VSM). The adsorption performance was investigated. MGO-MIP was found to have high loading (369 mg g −1 ) and selective capacity making the nanomaterial more performant than previous similar reported nanomaterials. The determination of Que. was carried out by mean of magnetic solid phase extraction method coupled with high-performance liquid chromatography (HPLC) and the extraction conditions studies were also performed out. Under the optimized conditions, MGO-MIP showed great performance for the extraction, separation and determination of Que. in green tea and serum samples, compared to the flavonoid analogs luteolin (Lut) and rutin (Rut) in the same matrix samples.
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JOURNAL OF FOOD PROCESSING AND PRESERVATION
·
2019
·Vol. 43
·期 9
·e14056
·
IF 1.288
Xiao Guo,Xuedan Cao,Ailing Guo,Erhu Li
Lactic acid fermentation was applied to Ougan juice (OGJ) for the first time. This study was conducted to improve the taste of OGJ by slight lactic acid fermentation. OGJ was separately fermented at 37°C using Lactobacillus plantarum and Lactobacillus paracasei . Results showed that lactic acid bacteria strains can utilize malic acid as a carbon source, without the consumption of sugar. The observed sugar:acid ratio was highest in the L. plantarum group (3.9) that fermented for 6 hr, and in the L. paracasei group (4.5) that fermented for 12 hr, which resulted in improved sensory acceptance (taste, acidity, aroma, color) of OGJ. Moreover, compared with unfermented OGJ, there were no significant changes ( p > 0.05) in total phenolics, total flavonoids, and ascorbic acid (Vc) content in the fermented Ougan juice (FOGJ). Slight lactic acid fermentation also improved the antioxidant activity of OGJ. In particular, neohesperidin and poncirin significantly decreased in L. plantarum group ( p < 0.05), while neohesperidin significantly increased in the L. paracasei group ( p < 0.05). Overall, slight fermentation with lactic acid bacteria can be used to improve the taste of OGJ, enhancing its quality to a certain extent. Practical applications This study made full use of the metabolic characteristics of lactic acid bacteria and developed a taste balanced fermented Ougan juice, which were an extension of fruits and vegetables deep processing technology and an exploration of new ideas for the research of fermented fruits and vegetables.
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Materials
·
2019
·Vol. 12
·期 18
·2923
·
IF 2.972
You Luo,Haiqing Liu,Shanzhong Yang,Jiarui Zeng,Zhenqiang Wu
The aim of this work was to develop green and bioactive films with sodium alginate incorporating guava leaf extracts. Seven formulations were performed with a different sodium alginate: Guava leaf water extract (WE)/ethanolic extract (EE) proportions (100:0, 90:10, 85:15, 80:20), and glycerol were used as a plasticizer. The HPLC-PDA analysis showed the main phenolic compounds in WE were gallic acid, ellagic acid, quercetin-3-O-β-D-xylopyranoside, avicularin and quercetin. The main polyphenols in EE were rutin, isoquercitrin, quercetin-3-O-β-D-xylopyranoside, avicularin, quercitrin, quercetin and kaempferol. Guava leaf extracts could greatly enhance the antioxidant activity, antibacterial activity, tensile strength and water solubility of the sodium alginate film as well as the water barrier property, while inducing a decrease in the moisture content and elongation at the break. The FTIR and SEM analyses indicated that intermolecular hydrogen bonding between the guava leaf extract and sodium alginate resulted in a more compact structure in the composite films. These results indicated that sodium alginate-guava leaf extract films might be developed into antiradical and antimicrobial food packaging materials.Keywords:bioactive film;sodium alginate;guava leaf extract;polyphenol;antioxidant;antibacterial
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NEW JOURNAL OF CHEMISTRY
·
2019
·Vol. 43
·期 37
·14747-14755
·
IF 3.069
Yanhua Sun,Yange Zhang,Zhiyu Ju,Liangfeng Niu,Zhaoxiang Gong,Zhihong Xu
In this study, novel quercetin imprinted polymers (MIPs) were constructed based on hydroxyapatite-stabilized Pickering emulsion polymerization, which were further applied for the specific recognition and selective separation of quercetin from the Spina Gleditsiae crude extract. The MIPs were synthesized via the imprinting technology by employing 4-vinyl pyridine as a functional monomer, divinyl benzene as a cross-linking agent and azodiisobutyronitrile as an initiator in the presence of quercetin. The prepared imprinted microspheres possessed a uniform spherical shape and the narrow diameter distribution of 55 μm. The batch mode adsorption experiments indicated that the adsorption capacity of the MIPs toward quercetin at 40 °C was 4.38 times that of the non-imprinted polymeric materials (NIPs) when the monomer polymerization time was 8 h. The equilibrium adsorption results fitted better with the Langmuir model, and the kinetic adsorption data provided a better fit with the pseudo-first-order model. Moreover, the adsorption capacity only decreased by 15% after five regeneration cycles. Therefore, the as-prepared MIPs were successfully used for the selective extraction of quercetin from Spina Gleditsiae. Additionally, the proposed method is simpler, and the extraction and purification of quercetin from Spina Gleditsiae can be realized in the same procedure. Hence, the novel imprinted materials provide an effective method for utilizing the active ingredient quercetin in Spina Gleditsiae.
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MOLECULES
·
2019
·Vol. 24
·期 16
·3016
·
IF 3.06
Ying Xue,Lin-Sen Qing,Li Yong,Xian-Shun Xu,Bin Hu,Ming-Qing Tang,Jing Xie
So far, there is no report on the quality evaluation of lemonade available in the market. In this study, a sample preparation method was developed for the determination of flavonoid glycosides by ultra-performance liquid chromatography–mass spectrometry (UPLC-MS) based on vortex-assisted dispersive liquid-liquid microextraction. First, potential flavonoids in lemonade were scanned and identified by ultra-performance liquid chromatography–time of flight mass spectrometry (UPLC-TOF/MS). Five flavonoid glycosides were identified as eriocitrin, narirutin, hesperidin, rutin, and diosmin according to the molecular formula provided by TOF/MS and subsequent confirmation of the authentic standard. Then, an ultra-performance liquid chromatography–triple quadrupole mass spectrometry (UPLC-QqQ/MS) method was developed to determine these five flavonoid glycosides in lemonade. The results showed that the content of rutin in some lemonade was unreasonably high. We suspected that many illegal manufacturers achieved the goal of low-cost counterfeiting lemonade by adding rutin. This suggested that it was necessary for relevant departments of the state to make stricter regulations on the quality standards of lemonade beverages.Keywords:vortex-assisted dispersive liquid-liquid microextraction;flavonoid glycoside;UPLC-MS;counterfeiting lemonade
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CHINESE JOURNAL OF ANALYTICAL CHEMISTRY
·
2019
·
IF 0.931
Li-Ting NIU,Gen-Gen LI,Hai-Feng LI,Fan CUI,Jing ZHANG,Ying HUANG,Kai CHEN,Jian-Fu ZHANG,Wen-Fei LI,Wei-Lu LIU
Genistein is an important isoflavone that has been widely used to prevent blood disease and cancer. In this work, a novel genistein electrochemical sensor was developed based on the composite of molecularly imprinted polymer (MIP) and carboxylated multiwalled carbon nanotubes (cMWCNTs). The MIP layer was electropolymerizated on the cMWCNTs modified electrode using carbazole as functional monomer and genistein as template molecule. The morphology and electrochemical performance of MIP/cMWCNTs were characterized by scanning electron microscopy (SEM) and cyclic voltammetry (CV), respectively. A series of experimental conditions were optimized, including the pH value of supporting electrolyte, electropolymerization potential range, molar ratio of functional monomers to template molecules, numbers of cycle, accumulation potential and accumulation time. Under the optimal conditions, the resulting electrochemical sensor (MIP/cMWCNTs/GCE) showed high performance, such as high sensitivity and selectivity towards genistein, a wide linear range (0.02–7.00 μM) and a low limit detection of 0.006 μM ( S / N = 3). The electrochemical sensor was applied to determination of genistein in tablets and human urine samples with satisfactory recoveries (97.9%–102.8%), and the accuracy of the sensor was demonstrated with the HPLC method.
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EUROPEAN JOURNAL OF LIPID SCIENCE AND TECHNOLOGY
·
2018
·Vol. 120
·期 5
·1700471
·
IF 2.2
Lingyi Liu,Zhou Jin,Min Wang,Wangyang Shen,Zhenzhou Zhu,Zhan Wang,Lianliang Liu
Natural phenolic compounds have been drawn a wide attention to replace the synthesis antioxidants due to the food safety issues, while, natural phenolic compounds are usually polyhydroxy derivatives which exhibit hydrophilic capacity, limiting their applications directly in lipid systems. In this work, olive leaf phenolics (OLP) are extracted by ultrasound from five cultivars and the optimal cultivar is chosen to prepare W/O nano-emulsions of Sacha Inchi oil (SIO, containing more than 90% polyunsaturated fatty acids). The droplet size could reach 2.15 ± 0.13 nm and remaines stable without phase separation during 30-day storage. Oxidative stabilities of SIO containing 0.02%, 0.05%, and 0.1% OLP (w/w) are evaluated by Rancimat test and accelerated storage test. The release of OLP by preparation of W/O nano-emulsions is capable of controlling the oxidative progress of SIO, by prolonging the induction time, preventing the production of primary and secondary oxidative products and also the deterioration of polyunsaturated fatty acids and tocopherols. Practical Applications : Sacha Inchi oil (SIO) contains approximately 90% of polyunsaturated fatty acids (PUFAs) associated with poor oxidative stability. Olive leaf phenolics (OLP) are considered as a great and cheap source of natural phenolic compounds. This study aimes to select the optimum source of OLP from five cultivars and to prepare a W/O nano-emulsion of OLP. By diluting the W/O nano-emulsion of OLP into SIO, effect of different concentrations OLP on the oxidative stability of SIO is evaluated through thermal oxidative stability and storage oxidative stability in an accelerated storage test. Results indicate that the capacity of OLP to retard the SIO oxidation depends on the incorporated concentration, which means that it is doable to adopt OLP, an abundant and cheap material, to improve the stability of edible oil with high PUFAs in the industry. Olive leaf phenolics are extracted and detected to prepare an efficient and stable W/O nano-emulsion; By diluting W/O nano-emulsion into Sacha Inchi oil, oxidative stability of the high content PUFAs oil is improved.
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MOLECULES
·
2018
·Vol. 23
·期 2
·459
·
IF 3.098
Ya Song,Xiao-Qun Wei,Mei-Ying Li,Xue-Wu Duan,Yuan-Ming Sun,Rui-Li Yang,Xiang-Dong Su,Ri-Ming Huang,Hong Wang
The aim of this work was to evaluate the main nutrients and their antioxidant properties of a Chinese wild edible fruit,Passiflora foetida,collected from the ecoregion of Hainan province, China. The analytical results revealed thatP. foetidafruits were rich in amino acids (1097 mg/100 g in total), minerals (595.75 mg/100 g in total), and unsaturated fatty acids (74.18 g/100 g in total fat). The lyophilized powder of edible portion contained the higher polyphenols content than the inedible portion powder. The UPLC-Q-TOF-MSEanalysis of the extractable and non-extractable phenolics indicated the presence of 65 compounds including 39 free phenolics, 14 insoluble-glycoside-phenolics, and 22 insoluble-ester-phenolics. In addition, the non-extractable phenolics obtained by alkali hydrolysis showed significant antioxidant activities by/through DPPH and ABTS radical scavenging. These findings ofP. foetidafruits, for the first time, suggest that these polyphenol-rich fruits may have potential nutraceutical efficacies.Keywords:Passiflora foetida;fruit;nutritional composition;antioxidant properties;UPLC-MS;phenolic compound
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高影响因子
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